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If anything, the 717hp on a limited production Hellcat and 707hp on the rest of the Charger Hellcats Judy’s lets me know they don’t want to upgrade my 2015 until next year.

Just the thought of not offering the Challenger Hellcat standard 717hp motor on all Charger Hellcats raises my blood pressure. If the additional 10 horsepower is free, put it on all Charger Hellcats for free.

Generally you bet. For the minor gain here fuel trims will get you pretty close - car already has a wideband in it (awesome).
There is a cool dyno clip of a hellcat stock, and next run with a drop in K&N.
Forget exact but it was more than 10hp
(granted you have to drive around at WOT for any of this to even matter right?)